Topo USA User Guide
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equator. This is because the grid system is based on the latitude/longitude coordinate
system.
60 seconds = 1 minute
60 minutes = 1 degree
A 1.5 degree grid = 9 30 minute grids, 324 5 minute grids, 8,100 1 minute grids, or
202,500 12 second grids.
A 30 minute grid = 36 5 minute grids, 900 1 minute grids, or 22,500 12 second grids.
A 5 minute grid = 25 1 minute grids or 625 12 second grids.
A 1 minute grid = 25 12 second grids.
Grid
Size
Factor
# of
Grids
# of
Grids
# of
Grids
# of
Grids
Display
Range
1.5
degree
9 x 30
minute
1
N/A
N/A
N/A
4-20
30
minute
36 x 5
minute
9
1
N/A
N/A
6-20
5 minute 25 x 1
minute
324
36
1
N/A
8-20
1 minute 25 x 12
second
8,100
900
25
1
11-20
12
second
N/A
202,500
22,500
625
25
13-20
Data Zoom Level/Scale Bar Translation
Your DeLorme application and your Earthmate PN-Series GPS device use different methods
for representing the map's scale. In DeLorme Topo North America, scale is represented as a
data zoom level (1-17). The Earthmate PN-Series GPS device uses a scale bar, based on the
measurement units chosen in Device Setup.
Summary of Contents for Topo North America
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